Unmanned aerial vehicle (uav) landing systems and methods

ABSTRACT

A system for landing an unmanned aerial vehicle (UAV) at a destination includes a landing coordination control unit that is configured to switch the UAV from a normal operating mode to a landing mode in response to the UAV entering a regulated airspace in relation to the destination. The normal operating mode includes normal instructions for flying and navigating to the destination. The landing mode includes landing instructions for a landing sequence into a landing zone at the destination.

RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.15/806,987, entitled “Unmanned Aerial Vehicle (UAV) Landing Systems andMethods,” filed Nov. 8, 2017, now U.S. Pat. No. _____, which is herebyincorporated by reference in its entirety.

FIELD OF THE DISCLOSURE

Embodiments of the present disclosure generally relate to systems andmethods for landing unmanned aerial vehicles (UAVs), and, moreparticularly, to systems and methods for automatically landing UAVs at adestination in an efficient and ordered manner.

BACKGROUND OF THE DISCLOSURE

UAVs (also known as aerial drones) are rapidly becoming accessible tobusinesses and individuals. For example, certain businesses may utilizeUAVs to deliver products to customers. As another example, an individualmay fly a UAV for recreational purposes.

Airspace at certain locations may be congested with a relatively highnumber of UAVs. Further, certain airspaces may be regulated for safety.For example, airspace around an airport, a professional sporting event,and/or the like may be regulated so as to restrict a number of UAVstherein.

Moreover, many UAVs may arrive at a particular location in the course ofa day. For example, various business-related UAVs may arrive at alocation at or proximate an airport, within a metropolitan area, and/orthe like. As can be appreciated, numerous UAVs arriving at a particularlocation may cause the UAVs to interfere with one another or othervehicles (such as commercial aircraft) at or proximate to the location.

UAVs may not be allowed to fly proximate to or land at certainlocations. Typically, in regions where UAVs are allowed to land, humanintervention is required to land the UAVs. With increased use, UAVs mayoutnumber commercial aircraft within an airspace. As such, in thefuture, human-based management and control of UAV traffic may provedifficult, if not impossible.

SUMMARY OF THE DISCLOSURE

A need exists for a system and method of coordinating arrivals of UAVsat a particular location. Further, a need exists for a system and methodfor automatically and safely landing UAVs at a particular location.

With those needs in mind, certain embodiments of the present disclosureprovide a system for landing an unmanned aerial vehicle (UAV) at adestination. The system includes a landing coordination control unitthat is configured to switch the UAV from a normal operating mode to alanding mode in response to the UAV entering a regulated airspace inrelation to the destination. The normal operating mode includes normalinstructions for flying and navigating to the destination. The landingmode includes landing instructions for a landing sequence into a landingzone at the destination. The landing sequence may include one or moreholding patterns.

The system may include a monitoring station that is separate anddistinct from the UAV. The monitoring station may include the landingcoordination control unit. The monitoring station may be at thedestination. In at least one other embodiment, the UAV includes thelanding coordination control unit.

In at least one embodiment, the landing coordination control unit isconfigured to overtake operational control of the UAV in the landingmode to automatically land the UAV at the landing zone. In at least oneembodiment, the landing coordination control unit is configured totransmit the landing instructions to the UAV.

The landing instructions may be stored in an operational control unit ofthe UAV. The UAV may include a signal sensor that is configured todetect a signal from the landing coordination control unit.

Certain embodiments of the present disclosure provide a method forlanding an unmanned aerial vehicle (UAV) at a destination. The methodincludes using a landing coordination control unit to switch the UAVfrom a normal operating mode to a landing mode in response to the UAVentering a regulated airspace in relation to the destination. The normaloperating mode includes normal instructions for flying and navigating tothe destination. The landing mode includes landing instructions for alanding sequence into a landing zone at the destination.

The method may include disposing the landing coordination control unitwithin a monitoring station that is separate and distinct from the UAV.Optionally, the method may include disposing the landing coordinationcontrol unit within the UAV.

Certain embodiments of the present disclosure provide a system forlanding unmanned aerial vehicles (UAVs) at a destination. The systemincludes the plurality of UAVs that are to arrive at the destination. Alanding coordination control unit is configured to switch the UAVs froma normal operating mode to a landing mode in response to the UAVsentering a regulated airspace in relation to the destination. The normaloperating mode includes normal instructions for flying and navigating tothe destination. The landing mode includes landing instructions for alanding sequence into a landing zone at the destination. The landingcoordination control unit is configured to automatically provide anorder of landing for the plurality of UAVs at the landing zone.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a box diagram of a UAV landing system, according to anexemplary embodiment of the present disclosure.

FIG. 2 is a schematic diagram of a UAV landing system that is configuredto coordinate arrival and landing of UAVs at a landing zone at adestination, according to an exemplary embodiment of the presentdisclosure.

FIG. 3 is a diagrammatic representation of a top view of a UAV,according to an exemplary embodiment of the present disclosure.

FIG. 4 illustrates a flow chart of a UAV landing method, according to anexemplary embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE DISCLOSURE

The foregoing summary, as well as the following detailed description ofcertain embodiments will be better understood when read in conjunctionwith the appended drawings. As used herein, an element or step recitedin the singular and preceded by the word “a” or “an” should beunderstood as not necessarily excluding the plural of the elements orsteps. Further, references to “one embodiment” are not intended to beinterpreted as excluding the existence of additional embodiments thatalso incorporate the recited features. Moreover, unless explicitlystated to the contrary, embodiments “comprising” or “having” an elementor a plurality of elements having a particular condition may includeadditional elements not having that condition.

Embodiments of the present disclosure provide systems and methods thatcoordinate arrival of one or more unmanned aerial vehicles (UAVs) atfixed locations, and sequence landing of the UAVs at the fixedlocations. Certain embodiments of the present disclosure provideunmanned aerial vehicle (UAV) landing systems and methods that areconfigured to control an approach and arrival of UAVs at a particularlanding location, such as a designated UAV port. In at least oneembodiment, the UAV landing systems and methods include a landingcoordination control unit that is configured to switch the UAVs to alanding mode within a defined regulated airspace. For example, the UAVsmay be switched to the landing mode as they enter a predefined distanceto the landing location. The predefined distance may be 50 feet, 100feet, 200 feet, or more, for example.

In at least one embodiment, the UAV begins a mission in a normaloperating mode, in which the UAV flies and navigates towards adestination that includes the landing location in a known, usual manner.In the normal operating mode, the UAV operates and flies according topreprogrammed instructions that cause the UAV to fly and navigate to thedestination. In response to the UAV entering regulated airspace aboveand around the landing location at the destination, the UAV switches tothe landing mode. In the landing mode, the UAV may detect and receivelanding instructions output by a landing coordination control unit. Forexample, the landing instructions may be sent via infrared signals,ultrasound signals, radio signals, and/or the like. The landinginstructions may be altered depending on current weather and trafficconditions proximate to the destination. Alternatively, the UAV may bepreprogrammed with the landing instructions, instead of receiving thelanding instructions (or instead of detecting and receiving landinginstructions).

Embodiments of the present disclosure provide UAV landing systems andmethods that integrate UAVs safely into airspaces, while allowingflexibility and spontaneity for UAV missions. Embodiments of the presentdisclosure provide automatic UAV landing systems and methods, which donot require humans to control UAV traffic.

FIG. 1 is a box diagram of a UAV landing system 100, according to anexemplary embodiment of the present disclosure. The UAV landing system100 includes a UAV 102 and a monitoring station 104. The monitoringstation 104 may be at or proximate a particular location at which theUAV 102 is to land. The monitoring station 104 is configured tocommunicate with the UAV 102, such as through infrared, laser,ultrasound, radio, and/or other such wireless signals.

The UAV 102 includes an operational control unit 106 that is operativelycoupled to a propulsion system 108, a communication device 110, and aposition sensor 112, such as through one or more wired or wirelessconnections. The propulsion system 108 may include one or more turbofanengines, one or more propellers, one or more rotors (such as used withhelicopters), and/or the like. The communication device 110 may be anantenna, transceiver, radio, camera, and/or the like that is configuredto receive and transmit wireless communication signals. The positionsensor 112 may be a navigational device, such as a global positioningsystem (GPS) device, that is configured to detect and determine aposition of the UAV in relation to a destination, for example.

The monitoring station 104 may be a land-based station at or proximateto the destination. Optionally, the monitoring station 104 may beremotely located from the destination. As another example, themonitoring station 104 may be onboard an aircraft, watercraft,spacecraft, or the like. In at least one embodiment, the monitoringstation 104 may be onboard a geosynchronous satellite.

The monitoring station 104 includes a landing coordination control unit114 operatively coupled to a communication device 116, such as anantenna, transceiver, radio, camera, and/or the like that is configuredto receive and transmit wireless communication signals. For example, thelanding coordination control unit 114 may transmit landing instructionsto the UAV 102 through the communication device 116. The UAV 102 and themonitoring station 104 communicate with one another through therespective communication devices 110 and 116. Optionally, the landingcoordination control unit 114 may be onboard the UAV 102, instead ofwithin the monitoring station 104.

In operation, the UAV 102 departs from a departure location towards adestination according to a normal operating mode, instructions for whichmay be stored within a memory of the operational control unit 106(and/or a memory coupled to the operational control unit 106). Thenormal operating mode includes normal instructions for flying andnavigating to the destination. For example, in the normal operationmode, the UAV 102 flies and navigates towards the destination accordingto a flight plan.

As the UAV 102 enters a regulated airspace in relation to thedestination, the UAV 102 switches form the normal operating mode to alanding mode. The landing mode includes landing instructions for alanding sequence into a landing zone at the destination. For example, asthe UAV 102 enters the regulated airspace (such as determined by theposition of the UAV 102 as detected by the position sensor 112), thelanding coordination control unit 114 may output a landing mode signalto the UAV 102. The UAV 102 receives the landing mode signal from themonitoring station 104. The operational control unit 106 receives thelanding mode signal, and switches the UAV 102 to the landing mode.

In at least one embodiment, the landing mode signal output from themonitoring station includes instructions for a landing sequence. In atleast one other embodiment, the operational control unit 106 ispreprogrammed with the instructions for the landing sequence, and thelanding mode signal from the monitoring station simply causes theoperational control unit 106 of the UAV 102 to switch from the normaloperating mode to the landing mode. In at least one other embodiment,when the operational control unit 106 switches to the landing mode, thelanding coordination control unit 114 overtakes operational control ofthe UAV 102 to automatically land the UAV 102 at the destination.

The landing sequence provides a coordinated, controlled landing of theUAV 102. For example, the landing sequence may cause the UAV 102 toinitiate a holding pattern at a particular altitude (such as 100 feet)for a predetermined time (such as 30 seconds), after which the UAV maydescend to a lower altitude (such as 50 feet) for a predetermined time(such as 20 seconds), before an approach and landing at a landing zoneat the destination. The landing sequence may include additional, less,and/or different holding patterns (or no holding patterns) for longer orshorter periods than indicated. It is to be understood that the landingsequence noted is merely a non-limiting example.

Further, a landing sequence may differ for different UAVs 102 based onUAV traffic in relation to a destination. For example, if numerous UAVs102 are proximate to the destination, the landing sequence for each UAV102 may include different holding patterns. As another example, if arelatively low number of UAVs 102 are proximate to the destination, thelanding sequence may not include any holding patterns, but may simplyinclude a direct approach and landing procedure.

FIG. 2 is a schematic diagram of the UAV landing system 100 that isconfigured to coordinate arrival and landing of UAVs 102 a, 102 b, 102c, and 102 d at a landing zone 200 at a destination 202, according to anexemplary embodiment of the present disclosure. As shown, the UAVs 102a, 102 b, 102 c, and 102 d are proximate to the destination 202, and areto land at the landing zone 200. More or less UAVs than shown may beproximate to the destination 202.

A regulated airspace 204 is defined at the destination 202 above andaround the landing zone 200. The regulated airspace 204 may be ahemispherical volume of space. For example, the regulated airspace 204may be defined by a radial distance r from a center of the landing zone200. The radial distance r may be 200 feet, for example. It is to beunderstood that 200 feet is merely a non-limiting example. The radialdistance r may optionally be greater or less than 200 feet (such as 1mile or 50 feet). Also, optionally, the regulated airspace 204 may beshaped other than a hemisphere. For example, the regulated airspace 204may be cylindrical or conical.

Referring to FIGS. 1 and 2, the UAVs 102 a, 102 b, 102 c, and 102 flytowards the destination 202 according to normal operating modes outsideof the regulated airspace 204. As the UAVs 102 a, 102 b, 102 c, and 102d enter the regulated airspace 204 (such as the UAV 102 c shown in FIG.1), the UAVs 102 a, 102 b, 102 c, and 102 d switch to the landing modes.As described above, the monitoring station 104 may output the landingmode signal to the UAVs 102 a, 102 b, 102 c, and 102 d upon entry intothe regulated airspace 204. The landing coordination control unit 114automatically coordinates the landing of the UAVs 102 a, 102 b, 102 c,and 102 d at the landing zone 200, such as based on the order at whichthe UAVs 102 a, 102 b, 102 c, and 102 d enter the regulated airspace204. In at least one embodiment, the position sensors 112 determine thelocations of the UAVs 102 a, 102 b, 102 c, and 102 d. The landingcoordination control unit 114 receives the communicated position signalsof the UAVs 102 a, 102 b, 102 c, and 102 d. In at least one otherembodiment, the monitoring station 104 may track positions of the UAVs102 a, 102 b, 102 c, and 102 d through separate tracking systems, suchas radar, satellite tracking, ADS-B, and/or the like.

As shown, the UAV 102 c is within the regulated airspace 204. As such,the UAV 102 c is the first to switch to the landing mode, and thereforemay be the first to land at the landing zone 200. The order of landingmay be based on the time each of the UAVs 102 a, 102 b, 102 c, and 102 denters the regulated airspace 204. Optionally, the landing coordinationcontrol unit 114 may coordinate the landing of the UAVs 102 a, 102 b,102 c, and 102 d based on additional factors, such as overall time offlight, capabilities of the UAVs 102 a, 102 b, 102 c, and 102 d (forexample, remaining power, remaining fuel, etc.), weather conditions, ageof the UAVs 102 a, 102 b, 102 c, and 102 d, and/or the like. Forexample, the landing coordination control unit 114 may reorder a landingqueue based on whether one of the UAVs 102 a, 102 b, 102 c, and 102 dhas been flying longer than the others. In this manner, a UAV 102 thatenters the regulated airspace 204 after other UAVs 102 may land beforethe other UAVs 102. As another example, the landing coordination controlunit 114 may arbitrate a landing order for multiple UAVs 102 that enterthe regulated airspace 204 at the same time, such as based on times offlight, relative sizes of the UAVs, departure points, and/or the like.

As shown in FIGS. 1 and 2, the landing coordination control unit 114 maybe housed within the monitoring station 104. Optionally, one or more ofthe UAVs 102 a, 102 b, 102 c, and 102 d may include the landingcoordination control unit 114. For example, an operational control unit106 of at least one of the UAVs 102 a, 102 b, 102 c, and 102 d mayinclude a landing coordination control unit 114 (or, the landingcoordination control unit 114 may be operatively coupled to theoperational control unit 106). In at least one embodiment, each of theUAVs 102 a, 102 b 102 c, and 102 d may include a separate landingcoordination control unit 114. As such, the UAV landing system 100 maynot include the separate and distinct monitoring station 104. Instead,the landing coordination control unit 114 may be onboard at least oneUAV 102 a, 102 b, 102 c, and 102 d, and the UAVs 102 a, 102 b, 102 c,and 102 d may communicate among themselves to coordinate landing of eachof the UAVs 102 a, 102 b, 102 c, and 102 d.

As described herein, the UAVs 102 operate according to a normaloperation mode outside of the regulated airspace 204 to fly and navigatetowards the destination 202. In response to the UAVs 102 entering theregulated airspace 204, the UAVs 102 switch to the landing mode. TheUAVs 102 may have instructions for a landing sequence stored within amemory, and/or may receive instructions for the landing sequence fromthe landing coordination control unit 114. The UAVs 102 follow theinstructions for the landing sequence to automatically land at thelanding zone 200.

In at least one embodiment, the landing coordination control unit 114overtakes operational control of the UAVs 102 in the landing mode toautomatically land them at the landing zone 200. For example, theinstructions for the landing sequence may be stored within a memory ofthe landing coordination control unit 114, and, instead of merelycommunicating the instructions to the UAV 102, the landing coordinationcontrol unit 114 may control the UAVs 102 in the landing mode accordingto the instructions.

The landing coordination control unit 114 provides instructions thatdefine one or more procedures for arrival and landing of the UAVs 102.The instructions are automatically output and/or otherwise followed inresponse to the UAVs 102 entering the regulated airspace 204 (such asupon the UAVs 102 reaching a predetermined distance to the landing zone200). Each procedure assigned to a UAV 102 may be adapted for theperformance of a particular UAV 102 (such as current speed, distance,angular position, and/or the like).

Referring again to FIG. 1, in at least one embodiment, the UAV 102 mayinclude a signal sensor 113 (such as an ultrasound, infrared, laser, orother such sensor), which may be configured to detect correspondingsignals output by the monitoring station 104. For example, when the UAV102 enters the regulated airspace 204, the UAV 102 switches to thelanding mode, and activates the signal sensor 113 to scan for and detectsignals output by the monitoring station 104. Until the UAV 102 receivesthe signals output by the monitoring station 104, the UAV 102 may be ina holding pattern. The signal(s) output by the monitoring station 104may include the instructions for a landing sequence. In response to theUAV 102 receiving the signal(s) from the monitoring station 104, the UAV102 may then initiate a landing sequence based on the receivedinstructions. Optionally, the UAV 102 may not include the signal sensor113, but instead may be in communication with the landing coordinationcontrol unit 114 as described herein.

As used herein, the term “control unit,” “central processing unit,”“unit,” “CPU,” “computer,” or the like may include any processor-basedor microprocessor-based system including systems using microcontrollers,reduced instruction set computers (RISC), application specificintegrated circuits (ASICs), logic circuits, and any other circuit orprocessor including hardware, software, or a combination thereof capableof executing the functions described herein. Such are exemplary only,and are thus not intended to limit in any way the definition and/ormeaning of such terms. For example, the operational control unit 106 andthe landing coordination control unit 114 may be or include one or moreprocessors that are configured to control operation of the UAV 102s, asdescribed herein.

The operational control unit 106 and the landing coordination controlunit 114 are configured to execute a set of instructions that are storedin one or more data storage units or elements (such as one or morememories), in order to process data. For example, the operationalcontrol unit 106 and the landing coordination control unit 114 mayinclude or be coupled to one or more memories. The data storage unitsmay also store data or other information as desired or needed. The datastorage units may be in the form of an information source or a physicalmemory element within a processing machine.

The set of instructions may include various commands that instruct theoperational control unit 106 and the landing coordination control unit114 as processing machines to perform specific operations such as themethods and processes of the various embodiments of the subject matterdescribed herein. The set of instructions may be in the form of asoftware program. The software may be in various forms such as systemsoftware or application software. Further, the software may be in theform of a collection of separate programs, a program subset within alarger program or a portion of a program. The software may also includemodular programming in the form of object-oriented programming. Theprocessing of input data by the processing machine may be in response touser commands, or in response to results of previous processing, or inresponse to a request made by another processing machine.

The diagrams of embodiments herein may illustrate one or more control orprocessing units, such as the operational control unit 106 and thelanding coordination control unit 114. It is to be understood that theprocessing or control units may represent circuits, circuitry, orportions thereof that may be implemented as hardware with associatedinstructions (e.g., software stored on a tangible and non-transitorycomputer readable storage medium, such as a computer hard drive, ROM,RAM, or the like) that perform the operations described herein. Thehardware may include state machine circuitry hardwired to perform thefunctions described herein. Optionally, the hardware may includeelectronic circuits that include and/or are connected to one or morelogic-based devices, such as microprocessors, processors, controllers,or the like. Optionally, the operational control unit 106 and thelanding coordination control unit 114 may represent processing circuitrysuch as one or more of a field programmable gate array (FPGA),application specific integrated circuit (ASIC), microprocessor(s),and/or the like. The circuits in various embodiments may be configuredto execute one or more algorithms to perform functions described herein.The one or more algorithms may include aspects of embodiments disclosedherein, whether or not expressly identified in a flowchart or a method.

As used herein, the terms “software” and “firmware” are interchangeable,and include any computer program stored in a data storage unit (forexample, one or more memories) for execution by a computer, includingRAM memory, ROM memory, EPROM memory, EEPROM memory, and non-volatileRAM (NVRAM) memory. The above data storage unit types are exemplaryonly, and are thus not limiting as to the types of memory usable forstorage of a computer program.

FIG. 3 is a diagrammatic representation of a top view of a UAV 102,according to an exemplary embodiment of the present disclosure. The UAV102 may include an airframe 320 and a plurality of propulsion systems322 coupled to the airframe 320. In general, the airframe 320 forms thestructural body or framework for the UAV 102. In the illustratedembodiment shown in FIG. 3, the UAV 102 includes four propulsion systems322, such that each propulsion system 322 is mounted to a respective arm324, 325, 326, and 327. In the illustrated embodiment, the UAV 102includes four arms 324-327 and a single propulsion system 322 that ismounted to each respective arm 324-327. Optionally, the UAV 102 mayinclude more or less propulsion systems 322, more or less propulsionsystems 322 per arm 324-327, and more or less arms 324-327 than shown.

The UAV 102 shown in FIG. 3 is merely one example of a UAV 102. The UAV102 may optionally be a fixed wing plane with various other types ofpropulsion systems. For example, the UAV 102 may be an unmanned planehaving one or more propellers, jet engines, and/or the like.

FIG. 4 illustrates a flow chart of a UAV landing method, according to anexemplary embodiment of the present disclosure. Referring to FIGS. 1, 2,and 4, the method begins at 400, at which a UAV 102 departs from astarting location towards the destination 202. At 402, the UAV 102operates according to the normal operating mode to fly and navigatetowards the destination 202.

At 404, the landing coordination control unit 114 (whether within themonitoring station 104 or onboard the UAV 102) determines whether theUAV 102 is within the regulated airspace 204 over and around the landingzone 200 at the destination 202. If the UAV 102 is not within theregulated airspace 204, the method returns to 402.

If, however, the UAV 102 is within the regulated airspace 204, themethod proceeds from 404 to 406, at which the UAV 102 switches to thelanding mode. In the landing mode, the UAV 102 may receive instructionsfor a landing sequence from the landing coordination control unit 114.For example, the landing coordination control unit 114 of the monitoringstation 104 may transmit the landing instructions to the UAV 102.

At 408, the UAV 102 then automatically lands (without humanintervention) at the landing zone 200 at the destination 202 accordingto the instruction for the landing sequence. The method then ends at410.

As described herein, embodiments of the present disclosure provide UAVlanding systems and methods that do not require human intervention. TheUAV landing systems and methods automatically, efficiently, and safelycoordinate arrivals of UAVs at a particular destination.

Embodiments of the present disclosure provide systems and methods thatallow large amounts of data to be quickly and efficiently analyzed by acomputing device. For example, hundreds if not thousands of UAVs mayattempt to land at a destination during the course of a day. The numberof UAVs may exceed the number of commercial aircraft within an airspaceduring that time. The vast amounts of data are efficiently analyzed bythe landing coordination control unit 114, as described herein. The UAVlanding systems and methods analyze data regarding the UAVs in arelatively short time. A human being (such as an air traffic controlleralready preoccupied with commercial aircraft) may be incapable ofanalyzing such vast amounts of data in such a short time. As such,embodiments of the present disclosure provide superior performance inrelation to a human being analyzing the vast amounts of data. In short,embodiments of the present disclosure provide systems and methods thatanalyze thousands, if not millions, of calculations and computationsthat a human being is incapable of efficiently, effectively andaccurately managing.

While various spatial and directional terms, such as top, bottom, lower,mid, lateral, horizontal, vertical, front and the like may be used todescribe embodiments of the present disclosure, it is understood thatsuch terms are merely used with respect to the orientations shown in thedrawings. The orientations may be inverted, rotated, or otherwisechanged, such that an upper portion is a lower portion, and vice versa,horizontal becomes vertical, and the like.

As used herein, a structure, limitation, or element that is “configuredto” perform a task or operation is particularly structurally formed,constructed, or adapted in a manner corresponding to the task oroperation. For purposes of clarity and the avoidance of doubt, an objectthat is merely capable of being modified to perform the task oroperation is not “configured to” perform the task or operation as usedherein.

It is to be understood that the above description is intended to beillustrative, and not restrictive. For example, the above-describedembodiments (and/or aspects thereof) may be used in combination witheach other. In addition, many modifications may be made to adapt aparticular situation or material to the teachings of the variousembodiments of the disclosure without departing from their scope. Whilethe dimensions and types of materials described herein are intended todefine the parameters of the various embodiments of the disclosure, theembodiments are by no means limiting and are exemplary embodiments. Manyother embodiments will be apparent to those of skill in the art uponreviewing the above description. The scope of the various embodiments ofthe disclosure should, therefore, be determined with reference to theappended claims, along with the full scope of equivalents to which suchclaims are entitled. In the appended claims, the terms “including” and“in which” are used as the plain-English equivalents of the respectiveterms “comprising” and “wherein.” Moreover, the terms “first,” “second,”and “third,” etc. are used merely as labels, and are not intended toimpose numerical requirements on their objects. Further, the limitationsof the following claims are not written in means-plus-function formatand are not intended to be interpreted based on 35 U.S.C. § 112(f),unless and until such claim limitations expressly use the phrase “meansfor” followed by a statement of function void of further structure.

This written description uses examples to disclose the variousembodiments of the disclosure, including the best mode, and also toenable any person skilled in the art to practice the various embodimentsof the disclosure, including making and using any devices or systems andperforming any incorporated methods. The patentable scope of the variousembodiments of the disclosure is defined by the claims, and may includeother examples that occur to those skilled in the art. Such otherexamples are intended to be within the scope of the claims if theexamples have structural elements that do not differ from the literallanguage of the claims, or if the examples include equivalent structuralelements with insubstantial differences from the literal language of theclaims.

What is claimed is:
 1. A system for landing an unmanned aerial vehicle(UAV) at a destination, the system comprising: a landing coordinationcontrol unit that is configured to switch the UAV from a normaloperating mode to a landing mode in response to the UAV entering aregulated airspace in relation to the destination.
 2. The system ofclaim 1, further comprising a monitoring station that is separate anddistinct from the UAV, wherein the monitoring station includes thelanding coordination control unit.
 3. The system of claim 2, wherein themonitoring station is at the destination.
 4. The system of claim 1,further comprising the UAV, wherein the UAV includes the landingcoordination control unit.
 5. The system of claim 1, wherein the landingsequence comprises one or more holding patterns.
 6. The system of claim1, wherein the landing coordination control unit is configured toovertake operational control of the UAV in the landing mode toautomatically land the UAV at the landing zone.
 7. The system of claim1, wherein the landing coordination control unit is configured totransmit landing instructions to the UAV.
 8. The system of claim 1,wherein landing instructions are stored in an operational control unitof the UAV.
 9. The system of claim 1, wherein the UAV comprises a signalsensor that is configured to detect a signal from the landingcoordination control unit.
 10. A system for landing a plurality ofunmanned aerial vehicles (UAVs) at a destination, the system comprising:a landing coordination control unit that is configured to automaticallyprovide an order of landing for the plurality of UAVs at a landing zone.11. The system of claim 10, further comprising a monitoring station thatis separate and distinct from the plurality of UAVs, wherein themonitoring station includes the landing coordination control unit. 12.The system of claim 11, wherein the monitoring station is at thedestination.
 13. The system of claim 10, further comprising theplurality of UAVs, wherein one of the plurality of UAVs includes thelanding coordination control unit.
 14. The system of claim 10, wherein alanding sequence for the plurality of UAVs comprises one or more holdingpatterns.
 15. The system of claim 10, wherein the landing coordinationcontrol unit is configured to overtake operational control of the UAVsin a landing mode to automatically land the UAVs at the landing zone.16. The system of claim 10, wherein the landing coordination controlunit is configured to transmit landing instructions to the UAV.
 17. Thesystem of claim 16, wherein the landing instructions are stored in anoperational control unit of at least one of the plurality of UAVs. 18.The system of claim 10, wherein the plurality of UAVs comprises a signalsensor that is configured to detect a signal from the landingcoordination control unit.
 19. A system for landing a plurality ofunmanned aerial vehicles (UAVs) at a destination, the system comprising:a landing coordination control unit that is configured to switch theplurality of UAVs from a normal operating mode to a landing mode inresponse to the plurality of UAVs entering a regulated airspace inrelation to the destination, and wherein the landing coordinationcontrol unit is configured to automatically provide an order of landingfor the plurality of UAVs at the landing zone.
 20. The system of claim19, further comprising a monitoring station that is separate anddistinct from the plurality of UAVs, wherein the monitoring stationincludes the landing coordination control unit.